The adrenal gland is named for its location adjacent to the kidneys: adrenal. The normal gland weighs 5 g and has a characteristic inverted Y, V, or T shape (Figs). The adrenal gland is made of cortex that is derived from the mesoderm and medulla derived from the neural crest. The adrenal cortex secretes cortisol, aldosterone, and androgens, and the medulla secretes epinephrine and norepinephrine. The adrenal gland is routinely identified at abdominal CT and MR imaging examinations.
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| Normal adrenal gland. Coronal reformatted image from helical CT data shows the triangular shape of the adrenal gland (arrows) and its relationship to the kidneys and diaphragms. |
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| Normal adrenal gland. T1-weighted breath-hold MR image demonstrates a normal left adrenal gland (arrow). |
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